Air brake



1935- c. A. CAMPELL i r 1,986,915

' AIR BRAKE Filed June 9, 1932 2 Sheets-Sheet i O -Y J 58 Inventor 65 L B @Yultlc-b@Qampbef Gttomegs This gradient isoccasioned by brakepipe'leakage,- 5. and in service. applications causeslthe brakes on Patented Jan, 8, 1935 f wer ca iitsnf aeaos g 1L,- assignbr' 5 M partition :ofN w P s- 5 a Jersey Company a cor- Applications Q1932; stea 1 ,326] l :.l go laifliszi (01 303- 87il This invention relatestoiair brakes aandkiparticularly to'means ,for neutralizingwthe harmful efiects of pressuregradient in the tbrakeppipe;

j the forward end of the train to applyrmore severely. Severe slack actiom and. damageito carsand lading often result. a On a long brake pipe, when the' erigineers brake I valve is in running positiomland theieed valvei is functioning, leakage produces afalling pressure gradient sometimes so pronounced. that brake" pipe pressure atthefrearend is. as much as pounds 'per square inch lower than: brake pipe pressure at the locomotive. It follows that the charges in the auxiliary reservoirsvarysimilafly. .In making a service-application the engineer- I moves his brake. valve :to service position until the I desired reduction is se'cured in the equalizing reservoir and then places the brak'e valve' in' lap.

The brakepipe pressure reduction tl 'us initiated runs through the brake pipe, being maintained and accelerated by local quick "service venting;

until it reaches the end of the trainifi The feedvalve is out of action, the equalizing dischargevalve has only limited capacity,ithe=quiclifservice ventshave lowered. pressure by aflmore or'less uniform amount to the end I of the train. Hence brake pipe pressure is higherr at the? front end:

and flow starts immediately towardfthejrearl Finally pressure in thebrakepip'e' -leve'l's off.

brake cylinder pressure, 'andsinc valves at the rear of the'trainwilll'lap firstfthose at the front feedingair to' the 'cylinders' over a longer period from t fully, charged reservoirs Hence the front brakesapply more heavily.

Pressure surges inthe brake pipe triid to causel valves to move through lap to release,and'then reapply, with obviously harmful effects; h

The present invention c'ontemplate'st e use of a stabilizing chamber associated withf and con-' trolled by a triple valve, in' suchj mannef="thatthe stabilizing chamber is 'ventedin release andre-z mains uncharged when the tripleval' moves initially to service position;

lizing'chamber is openedto brakepipe and "absorbs pressure fluid therefrom. Tliisihherently the chamber absorbs the crest ofthepressur When the valve starts to lap position the stabi l' viaveiandthe' serial action 'of .a few chambers willdiss'ipatethe waves energy. ccording to a further refinement of the ins vention a pressure shiftedldelay valve is'used to.

retard; flow from the auxiliary reservoirthrough theqtriple valve to the brake cylinder whenthe surge chamber is uncharged, and permitfree flow. 1 when Ithe' 'chamber is a charged. From it follows that service flow is delayed until the 101;.

triplevalves have once lapped and is free there-. after. Useful effects tare secured by opposing l ing chamber pressure to auxiliary reserE-u voir pressure in controlling such 'del'ayvalve.

bnshort trains an engineer sometimes. makes ai'continuousservice reduction in which the triple;

valves do notlap. In such case continuous re striction of flow to the brake cylinder would; H

niental reservoir, not drawn onin service; but 'Sincetriple valves move to lap position under the difierential between auxiliary' -reservoir pressure and brake pipe pressurevvithout'regard to used for furriishingjextra air in emergency.

f' 'An embodiment of the invention disclosing all the features above mentioned isillustratedin'the H j accompanyingdrawings, in which, reservoirshave, lower initial;chargesjthetriple triple'valvefshow'ing the triple valve in rel ase position, thedelay valve indelay position bypass valve in closedpositioni 1: is a vertic a1 axial section; through the 1 flow position and the bypass valve in open positionl.

.Fig. 3.,is a fragmentary view of the slide valve together with its'seat and graduatingvalve, the

parts being shown inquick service position, in which position the service port is Dartiallyopen andtliequickservice ports fully opened. 1 f

Fig. 4 is a similarlview showing thepartsin full service position in which thequick service ports remain-partially open andthe serviceport is fully opened. jlfi, i i Fig; 5-is avsimilanview showing the parts in preliminarylapposition. y r

'valve is indicated at 11 and is provided with the usual slide valve chamber bushing 12 which is formed with the usual slide valve seat.- The cyl- 1 inder bushing -13 is formed with a charging groove 14. The front cap 15 is sealed to the bodyll by means of the gasket 16, the gasket 16 servingin; emergency position as a seatfor the rim of the triple piston 1'7w as usual. The front cap 15 carries a plug 18 which serves as a spring .seat for two concentric coil compression "springs. I9. and. '21.?

The outer and heavier spring 19 reacts against a cup-like sliding stop 22, and the inner spring 21 reacts against a plunger stop 23 slidable in that when the piston engages the stop 23 without compressing spring 21, the parts are in quick service position of Fig. 3. When the piston 1'1 overpowers spring 21 and engages stop'22 without compressing spring 19, the parts are in fullservice position of Fig. 4. When both springs are overpowered the piston moves to emergency po sition'of Fig. '7. f When auxiliary reservoir pressure falls to approximately equalization with brake pipe pressure, the spring 21, acting through stop 23,shifts the piston 1'7 to move the parts toward lap position, but the stop 23 ceases to act when the parts reach the preliminary lap'position of Fig.5, so that motion" from preliminary lap position, Fig.

5.7 to. full lap position, Fig. 6, is dependent on pressure differential between the brake pipe and I cribed is-knownasthe delay valve. There is 1 When the piston l'l'isin its release position; Fig; 1, it seats against the e'ndiof the valve cham-' auxiliary reservoir.

ber bushing 12 asshown, and charging flow occurs through the groove 24. In order to simplify the illustrationno attempt has been made to illusexclude the use'of restricted release and recharge,

' if desired. The arrangement for accomplishing this result might follow conventional methods well known tothose skilled in the art.

The piston 1'7 is provided with a stem 25 which is guided at its innerend by the usual spider 26. Between the spider 26 and a collar 2'7 a slide valve .28 is confined, a moderate amount of lost motion'b'eing permitted. The graduating valve 29 is closely confined in a notch in the stem 25 and this moves relatively to the valve 28as an in. cident to the. lost motion allowed to the slide' valve. The slide valve and graduating valve are held: to their seats by the usual bow-springs, shown in the drawings.- 3, w I The triplevalve'12 is illustrated as of the well known pipeless type having a mounting flange 31 andmounting face 32 which is intended to' coact with a support to which appropriate con nections are made, and provided with ports which register with corresponding-ports of the triple valve. as usual. As suchmechanism is well known, it is not necess'ary'to illustrate the support. There are connections as follows:

33 leads directl'y from' the space within .the slide valve chamber to the auxiliary reservoir. 34 is a supplemental reservoir ..passage.' 35 is'the brakecylinder passage. 36 isthebrake pipe passage and 37 is the brake cylinder exhaust passage, which may be controlled by a retainer, notshown. Formed in-the body 11 aretwo. chambers, a

quick .service chamber 38 and a stabilizing chamber 39. Adjacent the stabilizing chamber 39, but out of communication therewith, is the valve chamber 41 for the delay valve 42. The delay valve 42 is of the slide type, and is confined in a notch in the longitudinally reciprocating stem 43 which is guided by reduced extensions 44 and 45 which work in guideways formed respectively in the body 11 and a cap 46. ,6 .The cap 46 clamps a flexible diaphragm 4'7 at its periphery, and this diaphragm is connected at its center to the stem 43;" The stem 43 carries an integral disk 48 and a removable clamping disk 49, which are essentially similar and which present convex surfaces to the diaphragm .47. The disks are notched at L their periphery to permit the free passage of air, the disks serving as limit stops. They are clamped. "bynut 50. the cup-like stop 22. The parts are so arranged 1 direct communication with the slide valve cham- The chamber 51 above the diaphragm 4'7 is in her 41, and this isconnectedsby the passage 52 withthe interior of the slide valve chamber 33,

and consequentlyxwith the auxiliary reservoir.

The space below the diaphragm 4'7 within the cap 46 is connected by the passage 53 with the stabilizing chamber 39. i

' There are two ports 54.and 55 in the seat for the slide valve 42 andtheslideyalvezis formed with a cavity 56 and a slender extension-5'7 leading therefrom. .Acoil spring 58 urges the stem 43 upward-toward that'position in which the cav-i ity 56freely connects the ports 54 and 55. When the spring ,58 is Loverpowered the extension 57 maintains a restricted communication between the ports 54 and 55. Y I

,The diaphragm actuated valve mechanism just a closely similar mechanism known as the secondary admission valve and'serving to offer a free bypass aroundthe constriction established by the delay-valveunder certain'conditions. The

secondary admission valve-comprises a slide valve chamber 61 having a seat for the bypass slide valve 62. This valve is'confined closelyin a notch in the stem 63. and the, stem 63. is guided at 64 in the body lland at 65 in the cap 66. The cap 66 serves to clamp the flexible diaphragm 67 at the marginalportions of the diaphragm, and this dia-.

phragm is clamped between two convex disks, of

which one, 68, is integral with the stem 63, and

of which the other, 69, is-removably mounted on an extension-of the stem'63 ,andclamped in position by a'nut 70.- 1

TheSchamber 71, above the diaphragm 67, communicates directlywith the slide valve chamber 61 and this inturn iscOnnectedby a passage '72 withgthegsupplemental reservoir connection 34.

The space .within the cap 66-below the diaphragm. G'Tisconnected. with the passage 52, already described, ijand consequently is at auxiliary reservoir pressure. -Thediaphragm 6'? is urged upward by a compression spring '73.

In the seat'for the slide va1ve'62 are two ports '74 and '751and'the slide valve 62 is formed with a cavity 76,, which in the lower position of the slide'valve bridges-the port s-' 74 and 75. In the upper position of the slide valve these ports are disconnected. The disks 68 and 69 serve as limit stops to control the motion of the stem 63 and slide valve 62. 1; I

The porting of the triple slide valve seat can now be described.

The quick'service measuring chamber seat port 7'7. leadsto the quick. service chamber 38. The brake pipe quick service seat port '78 leads to the,

valve starts to's'livid there isa rabid venting into restrieted brake cylinder new;

brake pipe cohheetioh as whieh es usual,- dothmuhieates with a space to the'lftofth'triiil piston 17; ra eeyhhder exhaust boi't 'l leads directly to the-exhaust connect on 37. A'

servieehortsi leads to the orts 55 and 75 in heeted with the ports 54 and tiwhie respje titely are in the seats for the he;

byoassvaivesz; v i a 'ihe stabilizing eh inber iioit s3 leads direetiy to 'the' stabilizing chamber- 39.: 'I'he ihdenendent exhaust soft 84 leads tdii dtly to atmosphereahd is notcorifiifill'edbynthfietaiiiifi its sole function is to exhaust the stabii leaseoosition" supplemental reser'vo as already explained, is connected-with thefwahre chamber 61 and hence funetiohs to filfl fl'l s lidg valve 62 to its seat and also to urge the diaphragm o'luownward. Theshde valve zs is provided with an exhaust oavity 8'6 whioh 'in release Lpos'ition haust part 79. An extension STSefVs i -teleasea position to conneet the quick servieeohahiber port 77 iwiththe exhaust passage '79. Y The'ports 86: ands't have noother functions. There are two through-*1 ports as :ana' 'a whieh extehdirom to tobottoin oi-the Slid-{Vdltei28 and which are conneeteaat their upper: oh by" cavity 91 win the graduating valve 29 when" the latter isincits outer (left hand) position relatively to the slide valvet see Figs? and 4 Poitsss and 891 are slightly ehlttrgedwoh the lower. -iaoe of the Slide valve 28 They fim'tifih quick a service position (Fighymoohjunetion witheav' junction with cavity 91 to offer. a Fstfiot ity 91, to connect ports "'1'? "and 78' fully t They" function in full service position: (Fig; 4. )i con:

munication between ports 77 "and '78} 1 Thus .the ehambert'sa sand beiore equalizatiomoecurs coiitinued motionorthe triple valve tow rd full service position restricts the flow and offers a gradual termination of quik seiwioe venting. There is an application port; 92 Whiohite'hds through the valve- 28 -frematop' to bottom "and whieh'is formed with an extension at lowe'i ehci so that it starts to registef with the port 81 in quiek servioe position and reaches full register therewith m m-h service position t l t Since the port 81 leads to theseats i the sl de valves 42* and 62 service flowiszcohtroiledty the action of these two Waltzes. Y Iii-emergency post-- tionthe port 92 registers with the'biake oylihder cylinder. At that time the ,valve 23 ex oses th' supplemental reservoir port 85st)" thatlzin other g'ncy both reservoirs" furnish? air: o the a towel? side totaoxiha y reservoir pressure; "The spring 73' assists auxi ar reservoir pressure, and

T At the upper end ofthettport 924isa tension 93 whicfzh remains 0pm when the grad= hating valve 29 is shiftdto preliminary lalp po'si tion (Fig 8). At this? positionhtl'ie gfaduating spring v2 1 ceases to acvsothat the final motion from preliminary lap to lap?bositwi'i'resultsfrom a g-radua'l bleeding" down of auxiliai'f'resei voir pressure by fiow to" the brake; cylinder until a;

sufficient presstxrfedifierehtial is develoiied on the alve' 4 and clitu nloef in re:

m it 85 leade-aiteeti to the su plemental reservoh annotation b'hwhiht epi lieation position extehsiohssa d its speial functions are broadly claimed in that applications serial No. 593,635; fild ebruary 17, 1-932,- frid serial No; 592,642; flied Februafy 12; 1932; and hence ardhefe lai-iiied'ohly ihspeeial combinations; The use of sivioe extension port, prodticifiga characteristic pre'liiiiinarylap position; is claiindin thepl'eseritapplication only in connetion withthstahiliziiig chamber. l t

' There is a port 94 which extends through the the outer'ehd of the raduating valve 29. In re- I'zts' position (Fig; 1) p011; 94registers with port Ss'ihthe seat and isexposed atits' up er end by thegi-auuating valve,- thus oo'imeeting the two reservoirs so that the supplemental res'er'voii fmay 1o valve as from tooth-b ttom and is controlled by;

assist in charging the auXi-liary; iesei voir fter service application, and soth'at' the two reservoirs he Concurrently e arged aiter'sueh equaih v zation or in release following anemergenoy ia'pplieation.

to bottoih or the slide valve 28 and provided with a fstfitioi' -oi choke es whiehhmits the how thioiighthe utt to a relatively small rate: This peetki ,pr hnhnary' lap an lap 'iios itioiis is in partialfrgiste; with the seat port 83 which leads' to the'stabilizing chamber" 39, and at suohtiinsthe "li lll li ii end of the port is connected by" cavity 91- to port 89whioh is" then ihoemmuhieatien t with the brake pipe seat port 78; Consequently in preliminar h and fun la positions, brake wave in the brake pipe and" absorb the wave en fgy'; time minimizing the pressu e waves in i the brake pipe wh ch would tend to cause valves to move beyond lat} position and then retuin' to The e is a loop et-t9: in the shoe valve- 23 and the sole fiintioh of this port is to connect tho stabilihing ehameer port 83 with the independent exhahsthortsi when the triple'valve is in felease It follows that the stabilizing Chamber 39 is vehtdin release position and only in 'release po-'- sitih.-

th t'ziplft alve iiiovs to quick siti aha S'IViCi po sitioiis the Stabilizing oha ihbr: receives no charge Consequently, the sfiaoeblow the diaphragm 47-r eh1ains at atmoseest'riet srvioetflow to the"biak oylihderf'At the same time the diaphragm 6'? is subjeton its upper" Sidnto supplemental is'erifoir pressiire whiohis" not drawn upon in service, and on its is so dimensione asto yield only when auxiliary rseri oi-ii bre'sshie falls 10 pounds below suppletiOIl; f a r t t t Wheh-the'tripl'e valve moves to reliminar la ofiulllafi position, chamber 39 is charged to where e thr'ehgh tort 95 extending from we brake pipe pressure, and; this pressure acts beneath the diaphragm 47.; Assisted byspring 58 it immediately shifts valve 4:2 upward to its free flow position. Consequently on an ensuingbrake pipe reduction service flow will be at the full or free flow rate. Until the valve moves to lap position it will be at the-restricted rate imposed by thepassage 57. However, if auxiliary reservoir pressure falls-a definite amount below supplemental reservoir pressure, the amount being determined by the spring 73 (andlassumed to be 10 pounds) the diaphragm 67 will move downward and shift the bypass valve 62 toits lowermost position in which it connects ports 74 and '75 and establishes free flow irrespective of the action of the valve L2, r

- The operation of the various parts has already been'described and the function of "the valve in its different positions can therefore be ,very briefly traced. i

Release position.1n release position the aux;- iliary reservoir and supplemental reservoir are charged from the brake pipe; ,The brake cylinder, quick service chamber 38, and thestabilizing chamber 39 are allexhausted. Thequick serv-' ice chamber and brake cylinder are exhausted 7 through connection 3I It is important to -note that'brake cylinder flow is through "port. 82 and hence not controlled by valve 42. The stabilizing chamber is exhausted through the independent exhaust port'84.

Quick service.As the spring 21 isrelatively light, the triple valve only falters in quick service position, In this position the brake pipe is i vented throughpcrts'W, 88, cavity 91 and ports 89 and 78, into the measuring chamberl Service flow through ports 92 and 81 starts, The drop in brake pipe pressure, occasioned-by quick service,-then shifts the valve to quick full service position, Fig. 4.; V 1 Q Full service.In full service. position the port 92 is in full register with the port 81 and the ports 88 and 89 have moved toa throttling position so that quick serviceflow to "the'chamber 38 is retarded before full equalization. between, brake ipe and the service chamber 38- occurs. (The idea of graduating quick service flow bythe slide '62 shifts.

and this action continuesas long as the triple valve remains in service position, or until valve Preliminary Zap position-On approach to equalization between auxiliary reservoir pressure and brake pipe pressura-Occasionedi by the reduction of auxiliary reservoir pressure as a result of; flowto the brake, cylinder, the lightgraduatingspring 21 will shift the piston to prelimi nary lap p,0sition, Fig. 5 In this position service flow is restricted to the capacity of extension 93 and the brakepipe port 78 is connected through choke 96 and port with the stabilizing chamber 39. Thus auxiliary reservoir pressure falls at a very-slow rate and thestabilizing chamber absorbs air from the brake pipe,rreducingtthe When the port lap tendency and, tending todissipate,wavefienergy in thebrake pipe. The riseof pressure in the chamber '39 will gradually establish brake pipe pressure beneath the-diaphragm 4'7, and at this time brake pipe pressure-is approximately equal to auxiliary reservoir pressure which, acts on the upper side of the-diaphragm 47; Hence the; spring 58 shifts the ,valve 42'to its upper or non-restricting position so'that upon an ensuing brake pipe reduction service flowwill be unrestricted.

Full Zap -position. The gradual reductionpf auxiliary reservoir pressure by flow to the brake cylinder, will establish a differential which will complete the lap movement'of. the valve. When this occurs the parts are'in thelposition of Fig. 6, and all flow to the brakecylinder is terminated.

It will be observed that ;.the shifting of ,the valve 42 is dependent on the'development-ofpressure in the chamber 39 and this is dependenton lap motion of the triplevalve.v Onshortrtrains continuous service applications are made, i. e., applications in which thetriple jvalve is not allowed to, move to lap position. Underithese conditions the valve62 will-respond to establish a'free flow bypass around the valve 42 when auxiliary-reser voir pressure acting beneath the diaphragm 67 has fallen-a fixed amount, assumed .to be 10' pounds, below supplemental reservoir pressure which is the same as the initial auxiliary reservoir pressure; This follows from the fact. thatgthe two reservoirs are charged concurrently,andlonlythe auxiliary; reservoir isdrawn uponin service.

Any volume so charged :andnot drawn'upon in service might be used for this-purpose, but it :is

desirable tov use a supplemental reservoir capable of furnishing additional air inemergency.

Emergency position-If the engineer makes an emergency reductionv of brake pipe .pressure, the triple piston moves until it. seats against the gasket, 16. Onsuch motion it overpowers both graduating springs and the parts assume the position shown in Fig. 7.'

In this positionthe emergency-reservoirport is exposed and both'emergency reservoir air and auxiliary reservoir air iiow throughthe applica-. tion port 92, to the brake. cylinder port :82. It

will be observed that the port 82- bypasses the valves 42 and 62 so that emergency flow is not restrictedbythese valves. a:

So far as the invention is concerned it isimmaterial whether such flow be controlled by other means or not, and to simplify'the'illustration no emergency control mechanism is-shown. Such mechanisms are common and: their useiswell understood, butnit is to be remarked'thatsince a separate path of flow is' afiorde'din emergency there is nothing inthepresentdisclosure to exclude such a device if itsuse is desired;

General considerations.-In describing this invention an effort'has beenqmadeto'simplify the disclosure; The drawings-are r'diagrammatic to the'extent that the ports areshownasif they all lay in a single 'plane.,= The object is to permit simultaneous flows to be traced. Features such as restricted recharge, restricted release, delayed emergency build-up, and many refinements which mightbe introduced in the design of the slide valve and graduatingzvalve have been omitted without, however, implying'that they are in any way incompatible with-the invention here described. There are various different'quick service mechanisms which are approximate equivalents of 1 each other, and while *a'quick service vent making use of a measuring chamber has been chosen for illustration; nonecessary liniitatiorr to this particular mchanismds implield. tOther types are known, some of which repeatt thatis, give quick service) acticn r on each: ibrak'e' valve initiated reduction of brake ipi'pe l pressure, and others .of which, likeithat showngli docnot repeat:

It is obviouslyimpracticable toiillust'rate all the variations (which mightibe introduced in known componentabut I wish expressly to note that ex vents said chamber and a: lap positionain whichit connects saidwbrake pip connection withi said 2. The combination of a stabihz ingachamber: and. a triple valve including a brake :pipe' connection* and having a releaseiposition in which it in said chamberandarranged to shiftsaid valve to restricting position when saidwchamber is unvents said chamber; a. service position in which it'isolates said: chambenil and a lap position in which'lit' connects said brake pipe with said chamber. 1,

3. The combination f a stabilizing chamber; and a tripleavalve including a b'rake pipe connection and having a release position: which it vents said chamber, aservice position in which it isolates said chamber, and a;lap :position in which it establishes, a restricted communication fromthe brake pipe, connection toysaidchamber;

such as will retard, without stopping, the initial lapping motion: of "the triple r valve, by reducing brakepipepressureilocallyl p i 4:, The combination of a stabilizing chamberya triple valve, including a brake." pipe-connection, an auxiliary reservoir connection 1 and a brake cylinderconnection, and having. a;release position" which it, ,vent'sl'said. chamber, a l service position in which it isolatessaid chamber, and a lap position in which; it tconnectsl'saidxbrake pipe with said chamber; delay valve means controlling flow to the brake cylindenin service position; and means actuated atgleast in part by ipressure charged and to non-restricting .positionwhenit is charged. 141

, 5; The combination of a stabilizingchamber a triple valve,,including a brake pipe connection, an auxiliary reservoir connection and a brake cylinder connection, and having a release position in which it vents said chamber, a service position in which it'isolates; said chamber, and-a lap position-in which itconnects said brake ;;pipe.with said chamber; delay valve means controlling flow to the brake cylinder in service positiong and means including an abutment-subject to the oppo p ssures said chamherwa dyin h auxiliary reservoir arranged to shiit said valve to I restricting: position ,whensaid chamber-fie -,un-,

ch ed nd t nonstric i o ti n: when it isgcharged. 6. The combination defined in-claim 4 iurther characterized that theftriple valve hasr an ne85.-.\' lheu .combinationiloi a stabilizing chamber} position when [it is charged.

and 7 a triple valve including a brake pipe connection, an auxiliary reservoir connection, a

brake cylinder connection and a yielding graduat ing stop, said triple valvehaving a release position in which it'vents said chamber and the brake cylinder, a service position inwhich it isolates said chamber and admits auxiliary reservoir air to the brake cylinder, a preliminary lap position {to which it is, moved by'said graduatingstop and inwhich'it restricts flow to the brake cylinder andpermits restricted flow from the brake pipe to said chamber, and a lap position in which it arrests flow to the brake cylinder.

it 9. Thecombination'of a stabilizing chamber;

and a triple valve'including a brake pipeconnection; an auxiliary reservoir connection, a brake cylinder connection and a yielding graduating stop, said 'triple valve having arelease posi tion int-which it vents-said chamber and the brakecylinder, a service position in which it iso lates said chamber and admits auxiliary reservoir'air-to the brake cylinder, a "preliminary lap position to which it is moved by said-graduating 'stop and in which it restricts flow to the brake cylinder and permits restricted new "from the brake pipe to said chamber, and a lap position in which itarrests flow to the brake cylinder and permits continuedfiow from the brakepipe to said chamber. i

. 10. The combination of :a stabilizing chamber;

a triple'valve includinga brake pipe connection, an auxiliary reservoir connection, a brake cylinder connection-and a yielding graduating stop, said triple valve having a release position in which it vents fsaid chamberand the brake cylinder, a

, servicej positionin which it isolates said chamber service position; and means actuated at least in part by pressure in said chamber and arranged to shift said valve to restricting position when said chamber is uncharged and to i non-restricting 11."The combination of a stabilizing chamber; atriple valve including a brake pipe connection, an auxiliary reservoir connection, a brake cylinder connection and a yielding graduating stop, saidtriple valve having a release position in which it vents said'chamber and the brakecylinder, a service-position in which it isolates said chamber and admits' auxiliary reservoir air to" the brake cylinder,a preliminary lap position to which it is moved by saidxgraduatingfstop and in which it restricts flow to'the brake cylinder and permits restricted flow from the brake pipe to said chamber, and a lap'positionin which it arrests flow to the: brake cylinder t and permits continued flow from the brakepipe to saidchamber; delay; valve means controlling flow to the brake cylinderin service position; and means including anabutment subject to the opposingpressures, in said chamber andin the; auxiliary: reservoir; arranged toshift said valveto restricting position when said chamberisuncharged andto non-restricting p s tioniwh n ti ch eed-- q 12. The combination oi astabilizing chamber;

a triple'valva: including abrake pipe connection,

an auxiliary reservoir ,conneotion '1 and a brake cylinder connection, and having ,a release position in which it vents said chamber,-,a service posi-v tion,and alap position in. which it connects said' brake pipe with said chamber; delay valve :means controlling flow to the brake cylinder in service position; means actuated atleast in part by pressure in said chamber and arranged to shift said valve to restricting position when said chamber is unchargedand .to'non-restricting position when it is-chargedyand means responsiveto adefinite reduction of auxiliary reservoir pressure to suspend the restricting action of said. delay valve. 13. The combination of, a stabilizing chamber; atriple'valve, including a brake pipe connection,

an auxiliary reservoir connection and a brake.

cylinder connection, and havinga release position inywhich itvents-said'chamben'a service position in :which it isolatessaid-chamber, and a lap posi-- tion inwhich it connects .saidbrake pipe, with said chamber; delay valve-means controlling flow to,-the brake cylinder in service position; means including-an abutment subject to the opposing pressures in said chamber and in the auxiliary reservoir arranged to shift said valve 'to restricting position when-said chamber is uncharged-and to non-restricting position when it is charged;

and means responsive to a definite reduction of it vents said chamber and the brake cylinder, a

service position in which itisolates said, chamber and admits auxiliary reservoir air to the brake I cylinder, a preliminary lap position to. whichit is moved by said graduating stopand in which it restricts ilow to the brake cylinder and permits restrictedflow from the-brake pipe to said chamber, and a lap position in which it arrests flow to thebrake cylinderand permits continued flow from thebrake pipe to saidchamber; delay valve means controlling flow to the brake cylinder in shift :said'valve to restricting position'when said chamber is uncharged and to non-restricting position when it is charged; and means responsive =to-a definite reduction of auxiliary reservoir pressure to suspend the restricting action-'offsaid delayvalve. i v

15. The "combination. of a stabilizing chamber; a triple, valve including a brake pipe connection, an 'auxiliaryreservoir connection, a brake cyline der connection and a yielding graduatingistop, said triple Valve having a release positioninwhich it vents said chamber-and the brake cylinder, .a service positionin which it. isolatessaid chamber and admits auxiliary reservoir air to the brake cylinder, a preliminary lap position 'to iiwhichiit is moved by sai'dgraduating stop and :in which it restricts flow to :the brake cylinder and :permits restricted .flow from thebrake pipeito saidlchamber, 'andsalap position in which .itzarrests flOWitO the brake cylinder and permits continued lflow from the'brake pipe to said chamber; delay valve means controlling flow to the brake cylinder in service position; means including an abutment subject to the opposing pressures in said cham-- ber and in the auxiliary reservoirj'arranged to shiftsaid valve-to restricting position wh ensaid chamber is uncharged and to non-restricting position when it is' 'charged; and means responsive to a definite reduction of auxiliary reseryoir :pressure' to suspend the :restricting actionof said delayjvallle. ,l

, 16; The "combination ,of :a-stabilizing chamber;

aitriple ivalvegincluding a? brake pipe :connection,

an auxiliary anda supplemental reservoir connection and a brakegircylinder connection, said tripler-yalve havingzra :release position in which it. vents said :chambergazservice positionoand :ai'lap a triplezvalveincluding:aubrake pipe connection,

an auxiliary :and a supplemental reservoir :connection .an'dra brake cylinder :connection, said triple valve having iarelease position in which it vents said chamber, a service position anda lap position sin-which iit connects :said ibrake pipe with saidicha'mb'er; two valves arranged .in parallelt'oicontrol fiowito-theibrake cylinder in service, onevalve having anon-restricting .and.a restrictingzposition andJthe otheranon-restricting and a flow interrupting position; yielding means urging said valves away fromitheir non-restricting positions; meansoperable by'the. establishment of pressureinvsaid chamber to shift :the first valve to non-restricting position; and means operable by.a definitezpreponderance10f supplemental over auxiliaryxreservoir pressure ito shift the second valve to non-=restricting:position.

I18. The-combination of claim '16 further characterized in thatsaid'trip1'e valve has an emergency position in which it connects .both said reservoirs with:saidibrake cylinder independently of 1 said delay valve means.

19. Thecombination of claim :llfurther characterized in that said triple valve has an emergency-position in which :it connects both said reservoirs withsaid brake cylinder independently of sa'i'd twovalves.

20. The combination of a stabilizing chamber; a triple valve including i a brake pipe connection, an auxiliary and a supplemental :reservoir connection and a brake cylinder connection, said triple valve having a release position in which it vents said chamber,-a service position in which it isolates said'chaniber and a lap-position in which it connects said brakepipe with said chamber; twovalves arranged in parallel to -control flow to the brake cylinder in service, one valve having anon-restricting and -a restricting :position and the other'a non restricting and a flow'interrupting position; yielding means urging said valves away rrom their non-restricting positions; an abutmentconnecte'd with the first of said two valves and subject to opposing chamber and auxiliary reservoir pressures; "and an abutment connected-withthe second of=said two valves and sub ject to opposing auxiliary reservoir and supplemental-reservoir pressures, auxiliary reservoir pressure opposing said yielding means onthe first abutment and assisting said yielding :means on the second abutment. 21; The combination-of a triple valve including a brake cylinder connection and' having a service position and a lap position; means normally active to restrict 'flowto-said brake cylinder connection in service position; and means rendered effective by motion of the triple valve to service and thence l said flow restricting means; and independent.

means renderedefiective by the production of a to lap position to suspend the actionjof said flow restricting means.

/ 22. The combination of a triple valve including a brake cylinder connection and having a release position, a service position and a lap position;

means normally active to restrictflowto said brake cylinder connection in service; means rendered effective by motion of the triple valve to service and thence to lap position to suspend the action of said flow restricting means; and means rendered efiective by motionof the triple valve to release position to restore the actionof said flow restricting means.

23. The combination of a triple valveincluding' a brake cylinderconnectionand having a service position and a lap position; means normally active to restrict flow to said-brake'cylinder connection in service position; means rendered effective by motion of the triple valve to service and thence to lap position to suspend the. action of substantial service application to suspend the action of the flow restricting means.

24. The combination of a triple valve including a brake cylinder connection and having a .service position and a lapposition; means normally active to restrict flow tosaid brake cylin der connection in service position; means renl dered efiective by motion of the triple valve to service and thence to lap position tosuspend the .action of said flow restricting means; and means. rendered effective by a definite reduction'of auxiliary reservoir pressure to suspend the action' of e 25. The combination of a triple valvefinclud ing a brake cylinder connection andhaving a service position and a lap position; meansnorder connection in service position; means rendered effective by motion of the triple valve to service and thenceto lap position to suspend the action of said flow restricting means; independent means rendered eiTective by the production of a substantial service application to suspend the action of the fiow restricting means; and means rendered effective by motion of the triple valve to release position to restore the action of said flow restricting means. p l

26. The combination of a stabilizing chamber;

a triple valve including a brake.pipe-connection, an auxiliary reservoir connectionand a brake cylinder connection, said triple valve havcylinder service port. distinct from each other, and having a release position in which it vents said chamber and connects said brake cylinder [exhaust port to an exhaust passage, a service position inwhich it isolates said chamber and ing a brake cylinder exhaust port and a brake disconnects "said exhaust port, and a lap position in which it connects the brake pipewith said chamber; delay valve means controlling flow to the brake cylinderthrough' said service port;

and means actuated at least in' part by pressure in said'chamber and arranged to shift said valve to restricting position when said chamberis uncharged and to non-restricting position when it is charged.

LZ'I The combination of atriple valve includ ing a brake pipe connection, anauxiliary reservoir connection and a brake cylinder connection,

'said triple valve having a brake cylinder port through which flow occurs in release and in emergency, and a distinct brake cylinder port through which fiow occurs in service;- and pressure actuated valve means for controlling therate of flow through said service port.

'28. Thecombination of a triple valve adapted -for connection with brake pipe, brake cylinder and auxiliary reservoir, said valve being shiftable between a plurality of positions including an application position and a lap position, andmeans comprising ports in said valve for venting a limited quantity of brake pipe air "as the triple valve approaches lap position by motion from said application position.

29. The combination of a triple valve adapted for connection with brake pipe, brake cylinder '35 and auxiliaryreservoir, said valve being shift-p able between a plurality of positions including an application position and a lap position, a nor-.

mally vented measuring chamber, and means rendered effective by approachof the triple valve to lap position from saidjapplication position, for connecting said chamber with the brake pipe. 30,.The combination of an automatic brake 'valve for use in conjunction with a brake cylinder, reservoir and brake pipe, said automatic valve comprising a valve having an application position and a lap position, anda piston for actuating said valve, said pistonmoving re-j sponse to the pressure difierential between the brake pipe and reservoir; and means operative as said piston; moves said valve from applica-. tion position to lap position'to vent a limited quantity of air from the brake pipe.

CHARLES A CAMPBELL. 

